A startling conclusion

Chimera has been sleeping more lately, and on Sunday he slept nearly all day. I was worried that he was sick, but he had a good appetite, and on Monday he was his normal self in the morning... Until we got back from our afternoon hike, and he slept for three hours again. And then I came to the startling conclusion that I'm actually meeting his physical and mental needs, and his crazy puppy energy is calming down. Whoa! Is the monster really growing up?